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  • 1
    ISSN: 1434-4475
    Keywords: Arylsulfonylacetophenones ; Thiophenes ; β-Enaminonitriles ; Thienopyrazolopyrimidines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Phenylsulfonylacetophenone1 reagieren mit einem Gemisch aus elementarem Schwefel und Malonsäurenitril zu den entsprechenden 2-Amino-4-aryl-5-phenylsulfonylthiophen-3-carbonitrilen2. Durch Umsetzung mit Stickstoffnucleophilen wie Cyanamid und Hydroxylaminhydrochlorid konnten aus Verbindung2a die entsprechenden Thieno[2,3-d]pyrimidin- und Thieno[2,3-c]pyrazolderivate erhalten werden. Das synthetische Potential und die Anwendbarkeit von5 zur Synthese polyfunktionell substituierter Thieno[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine (8,14,17,20,21) werden beschrieben. Die Strukturen der neuen Verbindungen wurden durch chemische und spektroskopische Methoden abgesichert.
    Notes: Summary Phenylsulfonylacetophenones1 react with a mixture of elemental sulfur and malononitrile to yield the corresponding 2-amino-4-aryl-5-phenylsulfonylthiophene-3-carbonitriles2. Compound2a could be annelated to the corresponding thieno[2,3-d]pyrimidine and thieno[2,3-c]-pyrazole derivatives3 and5 upon reaction with nitrogen nucleophiles (cyanamide and hydroxylamine hydrochloride), respectively. The applicability and synthetic potency of5 to develop a facile convenient route to the polyfunctionally substituted thieno[2′,3′:3,4]pyrazolo[1,5-a]pyrimidines8, 14, 17, 20, and21 is reported. Chemical and spectroscopic evidences for the structures of the new compounds are presented.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cycloadditions of thienopyridazines and a thienopyridine with electron-poor olefins and acetylenes as dienophiles are described. The nonisolable adducts undergo subsequent loss of hydrogen sulfide to give substituted phthalazines and substituted isoquinolines, respectively. © 1997 John Wiley & Sons, Inc.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 61-65 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methylhydrazones (III) of aromatic aldehydes and ketones react with nitrile imines (II) to give 1,2,3,4-tetrahydro-s-tetrazines IV (1-9) which exhibits “ring-chain” tautomerism in solution. The extent of this tautomerism is dependent both on steric and electronic effects of substituent groups at C-3 and C-6 ring carbons.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrachloro- and tetrabromo-o-benzoquinone react with furfurylidene-(2a) and 5-chlorofurfurylidene- (2b) nitromethane in boiling benzene to give the dihydrofurobenzodioxin adducts 3a-d, respectively, through a DIELS-ALDER type of reaction. In contrast, under similar conditions, tetrachloro-o-benzoquinone reacts with furfural and 5-chlorofurfural to give, in both cases, the ether 10 without incorporation of the furyl residue into the molecule. However, when the reaction is light catalysed, the polyhalohydroxyphenyl esters 11a and b are obtained. The thiophene analogue 11c is obtained in a similar manner. The reaction mechanism is discussed.The nitrovinylfurans, dihydrofurobenzodioxins and hydroxyphenyl esters showed well expressed growth inhibiting properties towards bacteria, fungi, and yeast. The activity of the products towards Biomphalaria boissi snails, the intermediate host of Schistosoma mansoni in Egypt, is discussed.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Methylmethacrylat und Cupferacrylat wurden bei 60°C mit Benzoylperoxid als Initiator in Substanz copolymerisiert. Dichte und Härte der erhaltenen transparenten festen Copolymere wurden bestimmt. Das chemische Reaktionsschema wird diskutiert. Die Reaktivitätsverhältnisse der Monomere wurden berechnet. Die erhaltenen Proben erwiesen sich als statistische Copolymere, deren elektrische Leitfähigkeit mit steigendem Cupferacrylatgehalt zunimmt, während die Aktivierungsenergie und die Glasübergangstemperatur abnehmen.
    Notes: The bulk copolymerization of methyl methacrylate with copper acrylate was carried out using benzoyl peroxide as initiator at 60°C. The density and hardness of the obtained transparent solid copolymer samples were investigated. The pattern of the chemical reactions is discussed. The monomer reactivity ratios were determined. The obtained samples were found to be random copolymers. The electrical conductivity of the obtained samples increases with the increase of Cu-acrylate content, while the activation energy as well as the glass transition temperature decrease.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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